Reducing the energy output of machine tools

12 August 2019

A recent test installation at a CNC lathe has demonstrated the ability of Rittal Blue e+ chillers to reduce energy consumption.

Bosch Rexroth AG runs an energy efficiency consultancy called GoGreen at its headquarters in the Bavarian town of Lohr am Main with the aim of examining and improving the energy efficiency of its own production plants worldwide. To this end, GoGreen works closely with institutes, as well as technology partners such as Rittal, to test possible solutions.

One of the most important research projects which GoGreen is involved in is the ‘Eta-Fab’ (energy efficiency, technology and application centre) project at the Technical University of Darmstadt.

Headed by the University’s Institute for Production Management, Technology and Machine Tools (PTW); the facility is able to closely replicate conditions and processes used in the Rexroth plant in Elchingen, allowing effective and accurate testing of potential innovations in areas such as improving the energy efficiency of machine tools.

Among the products made at the Elchingen plant are hydraulic pumps and motors for mobile machines.  Many of the components for the hydraulic power units are manufactured on a CNC lathe which has a total connected load of 75 kVA and runs for up to six days a week in three-shift operation.

CNC lathes need their spindles to be cooled to dissipate the heat generated by the drive technology – and this is typically achieved through liquid cooling.

The GoGreen team examined what would be the impact of replacing the existing compressor cooling unit on the lathe, with a new Rittal Blue e+ Chiller.  The Blue e+ delivers the cooling medium and its DC compressor, controlled by an inverter, generates the necessary cooling output in the chiller. A circuit then transports the cooling medium to the spindles.

The test demonstrated that the Blue e+ could reduce energy consumption. Leo Pototzky, GoGreen project manager, Bosch Rexroth, said of the trial: “The Rittal Blue e+ chiller consumes 50% less electrical energy than the old chiller, while the saving achieved by the cooling unit in the enclosure even exceeded 80%. This shows us that a great potential still exists in many sectors.”

The Blue e+ App communicates with the cooling units via NFC (Near Field Communication, an international transmission standard based on RFID technology for contactless data exchange), allowing important information to be transmitted wirelessly; a functionality which is especially important when a number of chillers have been configured.  It allows operators easy operational oversight and facilitates a swift response, if required

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